update ecmarkup to latest; clean up spec

.github/workflows/build.yml

@@ -0,0 +1,15 @@
+name: Build spec
+
+on: [pull_request, push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - uses: ljharb/actions/node/install@main
+      name: 'nvm install lts/* && npm install'
+      with:
+        node-version: lts/*
+    - run: npm run build

.github/workflows/deploy.yml

@@ -0,0 +1,23 @@
+name: Deploy gh-pages
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - uses: ljharb/actions/node/install@main
+      name: 'nvm install lts/* && npm install'
+      with:
+        node-version: lts/*
+    - run: npm run build
+    - uses: JamesIves/github-pages-deploy-action@v4.3.3
+      with:
+        branch: gh-pages
+        folder: build
+        clean: true

.gitignore

@@ -42,4 +42,6 @@ package-lock.json
 npm-shrinkwrap.json
 
 # Emacs droppings
-*~
+*~
+
+build